Audio Database


This pre-main amplifier inherits the digital support concept of the PM-84 and is refined by inheriting the AVSS.

Equipped with AVSS (Auto Voltage Shift Supply) that shifts the output supply voltage according to the power. By driving the power element at the output supply voltage most suitable for each power from small output to maximum output, high power is realized while maintaining the quality.

Designed for low impedance, it maintains power even when the speaker impedance momentarily fluctuates to an extremely low value.

Equipped with a direct switch, you can jump the tone amplifier and subsonic filter to feed the digital source directly to the power amplifier.
As a result, the signal path becomes the shortest path between the selector, volume, and power amplifier, enabling more pure playback.

In addition to the MM input, an MC input is also installed for playing analog discs.

There was a side wood sold separately.

Model Rating
Type Pre-main amplifier
Rated output 100W + 100W (8 Ω, 20 Hz to 20 kHz)
140W + 140W (4 ω, 1 kHz)
Output Bandwidth (8 Ω, 0.03% THD) 5 Hz to 40 kHz
Total Harmonic Distortion Factor (20 Hz to 20 kHz, 8 Ω) 0.015%
Cross modulation distortion factor 0.015%
Frequency characteristic 20 Hz ~ 20 kHz + 0 -0.3 dB
Damping factor (8 Ω) 100
Input Sensitivity / Impedance Phono MM : 2.5mV/47k Ω
Phono MC : 250 μ V/100 Ω
Tape, Tuner, Aux, CD : 150mV/25k Ω
Output impedance Tape out : 900 Ω
RIAA deviation 20 Hz to 20 kHz ± 0.2 dB
Signal-to-noise ratio (IHF-A network) Phono MM:86dB
Phono MC:70dB
Tape, Tuner, Aux, CD : 98 dB
Phono maximum allowable input MM:140mV
Tone control characteristics Bass : ± 10 dB (100 Hz)
Treble : ± 10 dB (10 kHz)
Subsonic filter characteristics 50Hz
Pwer 100 V, 50/60Hz
Power consumption 230W
External dimensions Width 416x Height 136x Depth 334 mm
Weight 10.5kg
Sold Separately Sidewood WPM-64 (¥ 4,000)